Instrument for setting up profiles



April 17, 1928. 1,666,563

s. HAGEN INSTRUMENT FOR SETTING UP PROFILES Filed Sept. 16, 1926 Patented Apr. 17, 1928.

SIGUBD HAGEN, OF DRAM'MEN, NORWAY.

INSTRUMENT FOR SETTING UP PROFILES;

Application filed September 16, 1926-, serial No. 135,945, and in Norway July 30, 1925.

The present invention relates to an instrument for automatic setting up of profiles by moving the instrument, mounted on wheels or the like, over the ground.

The annexed drawing shows by way of example an embodiment of my invention.

On the drawing:

, Fig. 1 shows the instrument mounted on a cycle.

Fig. 2 is a view of the apparatus seen from one side, the wall of the hous ng being removed.

Fig. 3 is a View of the apparatus as seen from the right in Fig. 2, and

Fig. 1 is a diagram illustrating the operation of the apparatus.

In the housing 1 of the apparatus are arranged two frames or partitions 2 and 3. To the partition 3 is secured 2. preferably U-shaped bracket 4 in which is rotatably journalled a shaft 5 which extends through the wall of the housing 1 and at its carries a wheel 6 through which the apparatus receives the necessary motive force, as described below. To the other end of the shaft 5 is secured a gear 7 which meshes with a gear 8 secured to a shaft 9 rotatably journalled in the bracket 4. On the shaft 9 is further pivotally secured a hoop 10 in the lower part of which is journalled a shaft 11 carrying a gear 12 which meshes with the gear 8. Rigidl secured to the gear 12 is a disc 13, the operation of which will be described below.

To the bracket 4 is also secured a frame 14 in which is rotatably journalled a normally vertical shaft 15, the lower end of which carries a friction disc 16, which engages the disc 13 at the point where the extended axis of the shaft 9 cuts the disc. Thus the shaft 15 is driven from the disc 13. The upper end of the shaft 15 carries a worm 17 meshing with'a worm gear 18 secured to a shaft 19. The shaft 19 carries a friction roller 20 coacting with a second roller 21 and acting to move a paper strip 22 from a cylinder 23 to a second cylinder 24. The said rollers and cylinders are all journalled in the partitions 2 and 3. In the said partitions and in the frame 14 is further journalled a shaft 25 carrying a friction disc 26, which normally makes contact with the disc 13 at the centre thereof or vertically over or below the said centre. The portion free end 27 of the shaft 25, which is situated between the partitions 2 and- 3 is screw threaded to receive a threaded member 28, the outer end of which carries a writing pin 29 arranged to write on the paper strip 22. In order that the member 28 shall not rotate with the shaft 25 the member 28 is also slidingly scoured to a cross bar 30. The apparatus further is provided with clamping means 31 or the like, for mounting on for instance usual cycle, as shown in Fig. 1. In this case the wheel or gear 6 may be connected with one of the wheels of the cycle by means of a belt or chain or the like and be driven therefrom. "When the shaft 5 thus is rotated it will, through the gears 7, 8 and 12 rotate the disc 13. The disc 13 then drives the disc 16 and thereby the worm 17 and worm wheel 18 and accordingly the shaft 19 and the rollers 20, 21 which determines the movement of the paper strip 22. Thus the paper strip 22 is fed from the cylinder 23 to the cylinder 24 at a rate which corresponds with the movement of the cycle or the like horizontally over the ground. The disc 13 also drives the friction disc 26 and thereby the shaft 25 and thus determines the displacement of the writing pin 29. This displacement is a function of the displacement of the apparatus in vertical direction as it is moved over the ground, as will be understood from the following description.

When the apparatus is moved over sloping ground. at an angle a with the horizontal plan, the rotating disc 13 will assume a corresponding inclined position (see Fig. 4) in relation to the friction discs 16 and 26, because the disc 13 is journalled in the hoop 10 which is .free to swing as a pendle on the shaft 9. If the movement along the ground takes place at a linear velocity =4; the rotating disc 13 assumes an angular velocity ='w which always is proportional to the said linear velocity '0. From Fig. 4 it is seen that then the periphery velocity o of the disc 16 is given by the formula:

v =w-rcos (a) where 1- is the distance between the centre of the disc 13 and the point of contact between the discs 13 and 16. i

The periphery velocity of the disc 26 is dependent both on the distance of its point; of contact with the disc 13 from the centre at the disc 13 and of the direction ot movemerit of the said point in relation to the plan of the disc 26. Usin the designations given in Fig. l the perip ery velocity cm of the disc 26 is found as follows:

Thus it is seen that the instrument provides for one movement corresponding with the horizontal distance and one movement for the vertical distance which is travelled over, and accordingly the profile may be automatically written down in known manner.

By the arrangement of the pendulum as a rotating disc (13} the periphery velocity of which is proportional to the linear velocity of the instrument, it is possible to com ensate for the action of movement irregu arities and shocks on the pendulum. Assume in Fig. 2 that the apparatus is moved from right to the left and the disc 13 rotates anticlockwise. A sudden stop of the linear movement-will also cause a sudden stop of the gears 6, 7 and 8. lit the pendulum, viz the .disc 13, were fully tree to swing on the shaft 9 such sudden stop would cause the pendulum to swing to the left. However, the rotation of the disc 13 will, due to the fact that the gear 12 rigidly secured to the disc meshes with the gear 8, tryto move the pendulum to the right. These two impulses of force act in opposite directions and are both proportional to the alteration of the velocity. 'lhey therefore may be caused to compensate each other, for all velocity variations, by proper choice of movement, velocity of rotation and moment of inertia of the disc 13. Thus undue pendulum movements may be fully compensated for a certain, chosen angle of inclination, f. inst. for a=().

Having now particularly described, and

escertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:

l. A profile tracing instrument comprising a pendulum disk, mounting means for said disk permitting free swinging of said disk through angles corresponding to angles of inclination of said instrument, means for driving said disk including a gear secured to said disk, a gear mounted on a relatively stationary part of said instrument in the line of the pendulum axis, and a gear rotatin in timed relation to the movement of sai instrument, said disk being driven in the direction of movement of said instrument, two friction disks mounted on a relatively stationary part of said instrument and in engagement with said first mentioned disk and positioned relatively thereto so that one friction disk receives a peripheral velocity proportional to the horizontal movement of the instrument, and the other receives a peripheral velocity proportional to the vertical movement of the instrument.

2. An instrument according to claim 1, in which the first of the said friction discs touches the rotating disc in an extension of the axis of the pendulum shaft, the second of the friction discs touching the rotating disc at some distance from the said shaft and having its main plane passing through the shaft.

3. An'instrumentaccording to claim 1, in which the friction discs control an indicating or writing device, the first of the said discs controlling the paper fed mechanism and the second disc controlling the driving mechanism of the writing pin.

4. In a profile recording instrument, a rotatable driving disk, mounting means for said disk permitting free swinging thereof in accordance with inclination of said instrument, and means comprising the inertia of said disk for compensating for shocks and irregular movements of said instrument.

In testimony whereof I afiix my signature.

SIGURD HAGEN. 

